Statistics Help
Question: Assume that the following data came from
identically and independently distributed normal
random variables N(u,o^2= 4)
The data
2.929 8.870 3.999 3.285 4.050
6.969 4.454 2.716 4.551 4.019
Find a 98% condence interval for u Edit
Answer: x bar= 4.5842 (Use excel to find average of 10 numbers).
sigma=sqrt(4)=2
Margin of error,e= {sigma/sqrt(n)} *z_c
z_c=2.33 at 98% confidence.
e=[2/sqrt(10)]*2.33=1.4736
Confidence Interval of mu=(x bar -e, x bar+e)=(4.5842-1.4736, 4.5842 +1.4736)=(3.1106, 6.0578) Edit
TutorTeddy.com & Boston Predictive Analytics
[ Email your Statistics or Math problems to help@teddycan.com (camera phone photos are OK) ]
Boston Office (Near MIT/Kendall 'T'):
Cambridge Innovation Center,
One Broadway, 14th Floor,
Cambridge, MA 02142,
Phone: 617-395-8864
Dallas Office (Near Galleria):
15950 Dallas Parkway,
Suite 400,
Dallas, TX 75248,
Phone: 866-930-6363